Question

_______ are used to measure the heat-producing capabilities of a chemical or mechanism. A. British thermal units B. Gallons C. Newton-meters D. Pound-feet

Answer 1

A. British *thermal units
The thermal units are related to heat and temperature.
WHY NOT...
B.Gallons is the measure for Volume like litres.
C.Newton metres is the measure of a force in a given direction
D.Pound feet is also a British mass length measure derived from FPS system .FPS means Foot ,Pound & Second as the standard unit if Length ,mass & time respectively.

Answer 2

A. British thermal units

Step-by-step explanation:

Now firstly we have to understand the definition of British thermal unit or BTU. It is defined as the amount of heat required to raise the temperature of 1 pound of water to 1 degree Fahrenheit. Now as expressed by its name, it is the unit for calculation of amount of heat. The most famous unit for heat is Joule.

1 BTU = 1055 Joules.

Now as we know, temperature is degree of hotness or coldness of body. So, for example, when on providing heat, when temperature of water raises from 50° F to 51° F, it will be stated that 1 BTU of heat is provided. Same concept can be applied for loss of heat.